use lots of clamps with a relatively stiff batten to spread the load evenly.

or place the board between a 'rock and a hard place' then shim the gap for even clamping.

its not likely you will need to transfer outline curvature or rocker to the ABS if the cross section is any reasonable size (1/2" square or less)

most likely you are having issues with the bond strength because ABS is similar to other olefins.epoxy is probably required for the adhesive, as well.do a google search on "flame treating ABS" which will improve bond strength.

IMOwrapping the rails with top and bottom laminating cloth seems a lot more reliable.so you can always use that as your backup plan.

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